Questions & Answers about Dziecko ma mały nos.
The verb mieć (to have) takes the accusative case, so why doesn't mały nos change its ending?
Because nos is a masculine inanimate noun (a non-living object). In Polish, the accusative case for masculine inanimate nouns—and the adjectives that describe them—looks exactly the same as the basic nominative (dictionary) form. If the noun were a living thing, the endings would change.
Is dziecko (child) grammatically male or female here?
Neither! It is a neuter noun, which you can usually tell by the -o ending. In Polish, words for young humans and baby animals are very often neuter, regardless of their actual biological gender.
Instead of saying mały nos (small nose), could I use a single word for "little nose"?
Yes, you can use the diminutive form nosek. Polish speakers use diminutives frequently, especially when talking to or about children. Saying Dziecko ma nosek sounds very natural and affectionately means "The child has a little nose."